Burglar-alarm for safes



(ModeL) W Y. CRUIKSHANK,

BURGLAR ALARM FOR SAFES. No. 300,310. PatentedJune 10, 1884.

WITNESSES: N INVENTO W wzfl fi BY w ATTORNEYS.

N. PiTERS. Phmvumc w. warmm n. c.

UNITED STATES Pnrnnr BURGLAR-ALA RM FOR SAFES.

SPECIFICATION forming part of Letters Application filed February 20,1884.

To all whom 2, it may concern.-

, Be it known that 1, WILLIAM Y. GRUIK- SHANK, of Danville, in thecounty of Montour and State of Pennsylvania, have invented a new andImproved BurglarAlarm for Safes, of which the following is a full,clear, and exact description.

The object of my invention is to provide a new and improved device forautomatically exploding an explosive cap or cartridge, and thus soundingan alarm if asafe is blown open.

The invention consists in the combination, with a spring-hammer, of atrigger-lever for holding it raised, and of a shaft connected with thetrigger, and with a device for revolving the shaft by means of thecompressed air created by the explosion in the safe, and whereby thetrigger will be drawn to release the hammer which is forced down andexplodes a cartridge or explosive cap held below it.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in both the figures.

Figure l. is a side view of my improved burglar-alarm. Fig. 2 is across-sectional elevation of the same on the line :0 :0, Fig. 1.

A shaft, A, is j ournaled in standards 13 on a base, C, and on the saidshaft are rigidly mounted a fly-wheel, D, and a pulley, E. Below theshaft a cylindrical chamber, F, is located, on the upper edge of whichthe edge of a hollow semi-spherical rubber cup, G, is secured, thechamber F and its cap being airtight. A rubber band, H, or other strap,is secured to the cap G at the middle of its upper surface, and has itsopposite end secured to the pulley E, the belt or band being wound oneor more times around the said pulley. Two horizontal arms, 18, projectfrom one of the standards B, and in the outer ends of the same avertically-sliding hammer, J, is guided, which hammer is surrounded by aspiral spring, K, for forcing it down. The hammerrod L is provided atits upper end with a ring or loop, L, for inserting a finger to lift thehammer. A rectangularly-bent triggerlever, M, pivoted on jaws M,projecting downward from the upper arm, B, has the end of Patent No.300,310, dated June 10, 1884.

(Model) its horizontal arm connected by a chain, N, with the shaft A.The lower end of the vertical shank of the trigger-lever is adapted toengage with a tooth or projection, O, of the hammer L. A rubber pad orblock, P, is held on the base 0 and below the hammer J.

The operation is as follows: The hammer J is raised and its projection Ois engaged with the trigger M, for the purpose of keeping the triggerraised. The shaftA is turned to wind the band H on the pulley E and drawthe band H taut, the chain N being slack, as shown. A cartridge orexplosive cap is placed on the pad or block 1?. If the safe in which theabove-described apparatus is placed is blown open, the air in the safewill be compressed, and will force the soft-rubber cap G downward intothe chamber F, thereby unwinding the band H from the pulley E and revolving the shaft A. The fly-wheel 1) thereby receives an impetus whichcauses the shaft to revolve after the band H has been unwound. The chainN is wound around the shaft A, is drawn taut, and pulls on thetrigger-lever M,

whereby the hammer is disengaged and forced down by its spring K,thereby exploding the cap or cartridge on the block or pad 1?. As theexplosion causes the trigger-lever to release the hammer, a short timeexpires be tween the blowing open of the safe and the explosion of thecap or cartridge by the hanr mer J. The explosion of the cap orcartridge can be heard distinctly, as the safe will be open by thistime.

Having thus described 111 yinvention, whatI claim as new, and desire tosecure by Letters Patent, is

1. The combination of a spring-hammer and a trigger therefor with acylinder provided with a ,collapsible cover or cap, and suitableconnections between the said cap and the trigger, whereby when anattempt is made to en ter a safe provided with the above alarm, by theuse of explosives the air within the safe will be compressed, therebycausing the cover or cap to collapse and through its connection withdrawthe trigger from contact with the hammer, substantially as set forth.

2. In a burglaralarm for safes, the combination, with the spring-hammerJ, of the trigger-lever M, the shaft connected by a chain with thetrigger M, the chamber F, the rubber cap G onthe same, and the band H,connecting the cap G with the shaft A, substantially as herein shown anddescribed.

3. In a burglar-alarm for safes, the combination, with the shaft A, ofthe fly-wheel D, the pulley E, the chamber F, the rubber cap G, the bandH, secured to the cap and to the pulley E, the spring-hammer J, thetrigger M, and the chain N, connecting the trigger M with the shaft A,substantially as herein shown and described.

Witnesses ADOLF STEINBRENNER, J ENNIE CRUIKSHANK.

